I just realized a lot of people who read this don't care half a crap about UltraSphinx, text parsing, Ruby on Rails, or developing a website. I want to make amends.
HEY LOOK! A DANCING BEAR!
If you're trying to develop Rails in Win32 and using UltraSphinx for full-text searching, drop this into ultrasphinx.rb, otherwise indexing won't work. You'll get an obscure error "FATAL: config file ''C:/rails/rails_apps/posterous/config/ultrasphinx/development.conf'' does not exist or is not readable" after running rake ultrasphinx:index.
Here's the code snippet to drop into line 157 of ultrasphinx.rake: if RUBY_PLATFORM =~ /(:?mswin|mingw)/
Good lord, we've launched a week and people are already trying to copy our site, feature-for-feature. Amazing... and infuriating.